Drawing and calibrating instrument



Jan. 1, 1924 J. GARCIA DRAWING AND CALIBRATING INSTRUMENT Filed Dec. 29. 2 Sheets-Sheet 1 TiIlEll-W Jan. 1, 1.924 1,479,598 L J. GARCIA DRAWING AND CALIBRATING INSTRUMENT File Dec. 29. 1922 1 2 Sheets-Sheet 2 'nventoz 50 se Qamcia Patented Jan. 1, 1924.

UNlTED STATES JOSE GARCIA, OF PHILADELPHIA, PENNSYLVANIA.

DRAWING AND CALIBBATING INSTRUMENT.

application filed December 29, 1922. Serial No. 609,698.

To all whom it may concern Be it known that I, Josn GARCIA, a subject of the King of Spain, residing at Philadelphia, in the county of Philadelphia and 6 State of Pennsylvania, have invented certain new and useful Improvements in Drawing and Calibrating Instruments, of which the following is a specification.

This invention relates generally to instruments such as are used by draughtsmen, machinists, tool-makers or mechanical workers generally in drawing, marking or calibratlhe invention has for an object to provide a novel and improved instrument of this t e.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended-claims in which the various novel features of the invention are more particularly set forth.

Fig. 1 of the drawings is a side view of 4 a calibrating instrument embodying the invention.

Fig. 2 is a longitudinal section on the line 22 of Fig. 1.

Fig. 3 is a horizontal section on the line 3-3 of Fig. 1.

Figs. 4 and 5 are similar views on the lines 4-4 and 55 respectively.

Fig. 6 is a detail perspective view showing a pair of inside caliper points adapted to be mounted in my improved holder. Fig. 7 is a similar view of a pair of outside caliper points.

Fig. 8 is a similar view of a pen point.

Figs. 9 and 10 are similar views to Figs. 1 and 2 but showing a modified form of the instrument.

Referring now to the invention as shown in Figs. 1 to 5 of the drawings I provide a rectangular frame piece 10 which is screwed as at 11, or otherwise rigidly attached at its lower end to a yoke-bar 12. Hinged at their upper ends to opposite ends of the yoke-bar 12 as at 13 are legs 14 having sockets 15 formed in their lower ends to re-' 0 ceive various types of instrument points, being shown in Fig. 1 as provided with divider points 16, the latter having diminished upper ends 17- which fit in the sockets 15 and are secured therein by set screws 18 threaded through the socket walls.

For swinging the legs 14 on their pivot points 13 they have pivotally connected 21 5 thereto, at points between their ends, the rigid links 20 whose opposite ends are pivotally connected with opposite sides of a head 21 swiveled on the lower end of a'vertical screw 22 which extends upwardly throu'gh the yoke-bar 12 and the lower part of the frame piece 10, passing freely through suitable apertures in these parts.

The upper end of this screw projects into a vertically elongated opening 24 in the frame piece 10, and has fixed thereon a plate 25 having formed on its corners a series of pointers 26 whichengage over the vertical side bars 10' of the frame'piece, which frame the sides of the opening 24. These sidebars 10' are suitably calibrated as indicated so as to show, as the pointers 26 move therealong, the spacing of the tips of the divider points.

The top of the frame piece 1O is inthe form of a circular head 28 which may have knurled portions to facilitate grasping of the instrument. The screw 22 is adapted to be moved by means of a nut 29 threaded thereon and held against axial movement between the opposite walls of a rectangular opening 30 in the frame piece 10 in which opening the nut is located. 7

If desired the divider points 16 may be removed and the inside calipers 31, shown in Fig. 6; or the outside calipers 32, shown in Fig. 7; substituted; or the pen point 33, shown in Fig. 8, employed. I

The screw 22 is shown as provided with a diminished, unthreaded, upward extension 22' which engages slidably in a boring 34 in the head 28.

In the modified form of the invention shown in Figs. 9 and 10 I have provided a means for locking the legs of the instrument in any position to which they may be set. In this construction the adjusting screw 22 is formed with a threaded axial boring 35 in which engages a screw 36 extending freely through a suitable aperture in the frame head 28 and having a knurled head 37 for turning purposes, this screw being preferably of a coarse pitch.

As will be apparent, during ordinary adjustments, the screws 22 and 36 move as a' unit. When the legs of the instrument are to be locked, the screw 36 is threaded inwardly in the boring 35 until its head 37 bears lightly on the frame head 28, thus binding 11 the threads of the screw 22 against the nut 29, and the latter against the top wall of U I claim as new and desire to protect by Let ters Patent of the United States is as fol-- lows v1. An instrument of the class described comprising a frame piece provided with graduation, a pair of legs pivctally attached thereto, a, screw ex'tendingfreely through the frame piece, a pair of links connectlng said legs to said screw, and a nut swiveled in the frame piece and threaded on the screw, and a pointer carried by said screw in registry with said graduations.

2. An instrument of the class described comprising a frame piece presenting an opening framed by a pair efcalibrated side bars, a pair of legs pivotally attached thereto, a screw extending freely through the lower portion of. said frame piece into the said opening, a plate on the upperend of said screw and having a series of pointer fingers projecting'across said calibrated side bars and serving to hold the screw against rotation, and a nut swiveled on the frame piece and threaded on the said screw.

3. An' instrument of the class described comprising a frame piece, a pair of legs pivotally attached thereto, a screw extending freely through the frame piece, a pair of links connecting said legs to said screw,and a nut swiveled in the frame piece and threaded on the screw, and locking means for said screw, said locking means comprising a second screw passing freely through the tops of the frame piece and threaded into a boring in the first screw.

4. An instrument of the class described comprising a frame piece presenting an opening framed by a pair of calibrated side bars, a pair of legs pivotally attached thereto, a screw extending freely through the lower portion of said frame piece into the said opening, a plate on the upper end of said screw and having a series of pointer finfgers projecting across said calibrated side bars and serving to hold the screw against rotation, and a nut swiveled on the frame piece and threaded on the said screw, and a second screw passing freely through the topof'said frame piece and threaded into a boring in the first screw, for the purpose specified.

In testimony whereof I have aflixed my signature.

Jose GAR-01A. 

